A Simple Tree Control

The formatting string %S=BLR% is used to specify that tree should be displayed with the familiar boxes and lines. The "B" directive indicates that open/close boxes should be displayed; the "L" directive indicates that lines should be drawn on the tree control, and the "R" directive indicates that the open/close boxes should be drawn at the root level.

In addition to the BLR directive, the X directive can also be used. This causes the dialog to open with the tree control fully expanded.